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Waste Water Engineering

Waste Water Engineering
pH value of sludge during alkaline regression stage, is

Less than 7
More than 6
More than 7
Less than 6

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Waste Water Engineering
The minimum diameter of a sewer is kept

15 cm
25 cm
10 cm
20 cm

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

213.5 cm/sec
313.5 cm/sec
500 cm/sec
413.5 cm/sec

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Waste Water Engineering
The minimum recommended diameter of sewers, is

5 cm
10 cm
15 cm
20 cm

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

80,000 to 10,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Sulphuric acid and napthamine
Potassium permanganate
None of these
Phenol-di -sulphuric acid potassium hydroxide

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